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The culprit often is "Tapatalk", a forum app that pops up a notification on every iOS device for a lot of forums.

Tapatalk is still completely opt-in though. Those forums have to include Tapatalk software within their own.

And for the most part, Tapatalk does improve the experience of navigating message boards.

It's opt-in for the forum admin, but it's opt-out for me... opt out every single fucking time I visit a forum that has opted in.